Support same url in different forms

Posted by Vikas Gulati on Pro Webmasters See other posts from Pro Webmasters or by Vikas Gulati
Published on 2012-12-19T11:37:35Z Indexed on 2012/12/19 17:14 UTC
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I have seen many websites supporting multiple forms of the same URL. For example consider www.example.com/question1/ OR www.example.com/Question1/ OR www.example.com/QUESTION1/ etc. all lead to one page with say

<link rel="canonical" href="http://www.example.com/question1/" >

or a 301 redirect to www.example.com/question1/.

Does this affect the page rank anyhow or its just for seemless user experience or there is some other reason behind this?

Infact even stackoverflow/stackexchange does this. No matter what the text after the id of the question in url they redirect you to the correct question!

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